ICS Malware: Triton - unpack trilog.exe

Hi.

I get the following error when trying to unpack trilog.exe by:

iml-user@ics-malware-triton:~/Desktop/Lab-Files/python_exe_unpacker$ python3 python_exe_unpack.py /Desktop/Lab-Files/trilog.exe

Traceback (most recent call last):
  File "python_exe_unpack.py", line 14, in <module>
    import pefile
ModuleNotFoundError: No module named 'pefile'

Thanks.